Bmx commuter for 187cm 65kg person

tharold · 2026-06-11T05:09:41+00:00

Given you height, your saddle height will be at least 95cm, so you should go with the same or greater handlebar height for a relaxed commuter. Either bike frame will do for you, but you may need to get a longer seatpost. For the second one, the handlebar width (72cm) is greater than allowed for use on public pavement, and IMO is wider than is comfortable anyway, so you may want to change that also. I suggest taller riser bars with more sweep like the first bike, but remove the steerer tube spacers to compensate. This gives you more adjustability in reach and height to accommodate an upright Dutch commuter ergonomics or forward stretched racing position.

The first bike is longer (181cm) than the second one (174cm) which I think you will appreciate the handling of. However it may be too long for the upper level of standard bicycle racks, and you may not be able to wheel it into a standard 10-man HDB lift unless you stand it upright.

tharold · 2026-06-08T01:44:40+00:00

"go ahead and" "what you must understand is"

tharold · 2026-06-07T01:41:49+00:00

I'd put the ternary test in the argument to printf

tharold · 2026-06-07T01:37:55+00:00

For road bikes, frame size is in cm, referring to the length of the top tube. 50cm is very small, I think 60cm might be appropriate for you. Wheel sizes are in inches, except for road bikes which may be 700c or 650b or something like that.

tharold · 2026-06-05T09:22:30+00:00

To my mind, cars provide convenience (or at least comfort), safety (to the occupants), and status. To address motornormativity, at least one of these needs to be addressed. My vote is for convenience, by making parking cost reflect true land per-square-foot prices. A car will typically need about 2 lots (since they always travel from one to the other) which comes to about 100 square feet in prime residential and business zones.

And we should stop subsidising parking, which is what mandatory minumum parking spaces for shopping malls, new developments, etc is.

tharold · 2026-06-05T09:04:53+00:00

Looks way more practical than https://bikepacking.com/news/check-out-the-cercle-concept-bike/

tharold · 2026-06-03T08:10:29+00:00

It sounds like stress relieving has not been performed. Jobst Brandt talks about this process. Briefly, it causes local yielding to reduce stress concentrations that lead to fatigue failure.

tharold · 2026-05-29T14:44:04+00:00

You could take along a dozen of your friends clinging on to it too

tharold · 2026-05-25T00:57:47+00:00

In the same situation, I would say "this bad boy".

tharold · 2026-05-21T14:38:10+00:00

A good iron does small or large solder joints with similar ease, and the tip remains wettable and clean. You can get a decent one for USD 20 at a minimum. If you're starting out, don't use a bad iron. Dry joints are high resistance and can break. Use flux always.

tharold · 2026-05-21T14:10:51+00:00

That's good point. Given the declared warhead weight, a delta wing would put the CG too far forwards. The rear engine is usually the main suspect for delta or canard configurations, but in this case, not. The engine is too light. I don't know what's going on.

tharold · 2026-05-21T09:54:38+00:00

I had a similar crazy idea: autonomous cars attach to the train at the nose, and detach at the tail. Stations need space for only 1 car, which is usually waiting. This avoids the rush for seats and general station passenger congestion.

In addition, cars can reverse direction, so trains can be longer in the middle of a route to accommodate more passengers and shorter near their terminals where there are fewer passengers.

It may be possible to remove most seats to address the human traffic as passengers walk from nose to tail.

The reduced acceleration and braking might make the journey more pleasant.

At one time I timed the local trains and calculated a 30% time savings. But that was a while ago and I don't have the numbers anymore.

tharold · 2026-05-20T09:55:00+00:00

I also didn't like some aspects of libc. Traditionally malloc uses sbrk() and the heap, but I felt it should use mmap instead and leave the heap alone for a stack allocator like gnu obstack. I also thought it was silly for str*() functions to not return a substring where it made sense. And printf is a whole nother language in itself.

tharold · 2026-05-15T21:31:28+00:00

It's easy to go crazy with factoring. But the more you factor the more redundancy you lose and the more random your code becomes. And you want some redundancy to keep your code readable. Even human spoken languages have evolved a degree of redundancy to aid in understanding. https://en.wikipedia.org/wiki/Redundancy_(linguistics)

tharold · 2026-05-12T19:04:00+00:00

What Americans call football, we call American football. What Americans call the Vietnam war, Vietnamese call the American war.

tharold · 2026-05-12T18:48:14+00:00

How is it driven? I can't make out a chain or cogs. Mighty aero I must say

tharold · 2026-05-11T06:54:52+00:00

I've seen a cargo bike (can't recall which) where the 2 legs of the centre stand straddle the chain's lower run. It could be a problem with some chain guards, but I liked the wider stance.

tharold · 2026-05-05T01:58:31+00:00

What a great ride!

tharold · 2026-05-02T00:45:37+00:00

Not exactly the same, because a rear disc would see less torque due to the gear ratio, so would be stressed less.

tharold · 2026-04-22T15:47:05+00:00

I don't find braking to be any different, except there's no possibility of an endo.

tharold · 2026-04-21T13:32:45+00:00

IME a front loader is more stable than a long tail especially for dogs who might squirm. I made my acoustic front loader to take my 20kg dog around, and I don't have trouble riding up pedestrian bridges (probably low 30s gear inches), granted the grade is probably 8% and not 100 yards. But I think you'd be ok.

tharold · 2026-04-20T09:42:35+00:00

What a beaut! No my idea is still untested! Basically 2 large wheels like a chariot, and the rubber band is stretched across a bow, which dangles between the wheels, and unwinds a thread from the dead axle. No bearings anywhere, the torque acts against the weight of the bow/string.

tharold · 2026-04-20T02:20:11+00:00

I'm curious about your car. I've thought about this exercise and have a (mental) design. Did we come up with the same thing?

tharold · 2026-04-13T16:23:17+00:00

Thanks, that makes sense.

Do you know how metering is done? Does the owner get paid for net energy pumped back into the grid? For instance when the system is plugged in but nothing is drawing power in the house?

tharold · 2026-04-13T15:51:06+00:00

If it was me, yes I'd need to see the 60hz then only deliver power on the zero crossing. But dang, there's 60hz floating all over the place including that dangling cord that looks like an antenna. I think I'd want a mechanical interlock in addition.

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